our duty        some housework at home
A．It’s ；to do B．It’s ；doing
C．That’s；doing D．That’s； to do
A

試題分析：句意：在家做家務(wù)是我們的責(zé)任。it代替動(dòng)詞不定式作主語(yǔ)。故選Ａ。
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